10.5880/fidgeo.2021.017 Tourian, Mohammad Mohammad Tourian 0000-0002-4200-0848 Institute of Geodesy, University of Stuttgart, Stuttgart, Germany Elmi, Omid Omid Elmi 0000-0003-2668-735X Institute of Geodesy, University of Stuttgart, Stuttgart, Germany Shafaghi, Yasin Yasin Shafaghi Institute of Geodesy, University of Stuttgart, Stuttgart, Germany Behnia, Sajedeh Sajedeh Behnia Institute of Geodesy, University of Stuttgart, Stuttgart, Germany Saemian, Peyman Peyman Saemian 0000-0003-2612-8718 Institute of Geodesy, University of Stuttgart, Stuttgart, Germany Schlesinger, Ron Ron Schlesinger 0000-0001-6999-8663 Institute of Geodesy, University of Stuttgart, Stuttgart, Germany Sneeuw, Nico Nico Sneeuw 0000-0003-1796-0131 Institute of Geodesy, University of Stuttgart, Stuttgart, Germany GFZ Data Services 2021 Surface water extent from satellite imagery Water level from satellite altimetry Water Storage Anomaly from satellite gravimetry River discharge from satellite altimetrytr Earth Observation Satellites > CRYOSAT Earth Observation Satellites > Earth Explorers > CRYOSAT-2 Earth Observation Satellites > ENVISAT Earth Observation Satellites > JASON-1 Earth Observation Satellites > LANDSAT Earth Observation Satellites > NASA Decadal Survey > GRACE II Earth Observation Satellites > NASA Earth System Science Pathfinder > GRACE Earth Observation Satellites > OSTM/JASON-2 Earth Observation Satellites > SARAL Earth Observation Satellites > Sentinel GMES > SENTINEL-3 Earth Observation Satellites > TOPEX/POSEIDON Earth Remote Sensing Instruments > Active Remote Sensing > Altimeters > Radar Altimeters > ALTIKA Altimeter Earth Remote Sensing Instruments > Passive Remote Sensing > Spectrometers/Radiometers > Imaging Spectrometers/Radiometers > MODIS EARTH SCIENCE SERVICES > DATA ANALYSIS AND VISUALIZATION Tourian, Mohammad Institute of Geodesy, University of Stuttgart, Stuttgart, Germany Schlesinger, Ron Institute of Geodesy, University of Stuttgart, Stuttgart, Germany Dataset 10.5194/essd-2021-174 10.3390/rs8121005 10.5067/ATLAS/ATL13.003 10.1175/JHM-D-13-0157.1 10.5880/ICGEM.2018.003 10.1038/nature20584 10.5270/en1-ajb696a 10.1002/2013WR013847 10.1016/j.jog.2012.02.001 10.1016/j.scitotenv.2020.139857 10.1007/978-3-319-43744-6_11 10.1007/s10712-014-9300-4 10.1016/j.rse.2014.10.006 10.1007/s11200-009-9007-z 10.1016/j.jhydrol.2017.01.009 10.1002/wrcr.20348 10.1002/2015WR017654 10.1007/1345_2015_170 10.3390/w9100753 10.1002/2017WR021150 CC BY 4.0 Against the backdrop of global change, both in terms of climate and demography, there is an increasing need for monitoring global water cycle. The publicly available global database is very limited in its spatial and temporal coverage worldwide. Moreover, the acquisition of in situ data and their delivery to the database are on the decline since the late 1970s be it for economical, political or other reasons.

Given the insufficient monitoring from in situ gauge networks, and without any outlook of improvement, spaceborne approaches are currently being investigated. Satellite-based Earth observation with its global coverage and homogeneous accuracy has been demonstrated to be a potential alternative to in situ measurements. The Institute of Geodesy (GIS), within the Faculty of Aerospace Engineering and Geodesy at University of Stuttgart has a long-standing expertise, both theoretically and practically, in dynamic satellite geodesy. In recent years, GIS initiated and participated in studies and projects on application of spaceborne geodetic sensors for hydrological studies. HydroSat provides the results of these studies and projects, in which spaceborne geodetic sensors are used to estimate Surface water extent from satellite imagery Water level from satellite altimetry Water Storage Anomaly from satellite gravimetry River discharge from satellite altimetry, imagery or gravimetry
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